1. CELL DIVISION AND MITOSIS

2. STUDENTS WILL… Define Cell Division
Explain the importance of Cell Division.
Identify the 2 kinds of Cell Division
Describe the events in cell cycle.
Examine the steps of Mitosis
Compare mitosis in plant and in animal cells.

3. VOCABULARY Cell Division Mitosis Chromosome Chromatids Centromere
Interphase
Cytokinesis

4. Cell Division
A process in which a parent cell divides into 2 daughter cells.
WHY?
GROWTH
REPLACE WORN OUT CELLS/DAMAGED CELLS

5. 2 KINDS OF CELL DIVISION 1. MITOSIS (animal and plant cells)
2. MEIOSIS (human reproductive cells)

6. The Cell Cycle -95% of cell cycle in interphase
-The sequence of growth and division of a cell.
-95% of cell cycle in interphase
-5% of cell cycle in mitosis

7. CELL CYCLE

8. STEPS IN CELL DIVISION
INTERPHASE
MITOSIS
CYTOKINESIS

9. INTERPHASE -Where cells spends the majority of its time
-Preparation phase
-Where cells spends the majority of its time
-“living phase of the cell”
-Where duplication of DNA happens

10. 3 stages of Interphase:
1.Growth Stage 1 (G1) – cell grows and function properly.
2.Synthesis Stage (S) – duplication of DNA
3.Growth Stage 2 (G2) – cell resumes growth, preparation for Mitosis

11. MITOSIS
Stages:
Prophase
Metaphase
Anaphase
Telophase
- The process of cell division which results in the production of two daughter cells from a single parent cell.

12. Important to know: Chromatids -identical DNA strand Centromere-
-a region of DNA at
The middle of
Chromosome where
the sister chromatids
Come in contact.

13. Prophase Chromatids are visible
Nucleolus, nuclear membrane disintegrates
Spindle fibers begin to form

14. PROPHASE
ANIMAL CELL
PLANT CELL

15. Metaphase Chromatids pair align at the center (equatorial plate)
Centromere attached to spindle fiber

16. METAPHASE
ANIMAL CELL
PLANT CELL

17. Anaphase
Each chromatid pairs splits at the centromere and move at the opposite side.
Spindle fiber begins to shorten

18. ANAPHASE
Animal Cell
Plant Cell

19. Telophase Chromosomes moved into opposite poles.
Nuclear envelopes reforms.
Spindle fiber disappear.
Cytoplasm begin to separate.

20. TELOPHASE
Animal Cell
Plant Cell

21. Cytokinesis Cytoplasm divides Two new daughter cells are formed.
New cells will enter interphase and again cell division happens

22. Animal Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase                                                             
Cytokinesis                                                             

23. Plant Mitosis -- Review
Interphase                                                             
Prophase                                                             
Metaphase                                                             
Anaphase                                                             
Telophase                                                             
Cytokinesis                                                             

24. RESULTS OF MITOSIS: Division of nucleus.
Production of 2 nuclei identical to each other.
Nucleus has the same number of chromosomes and type
23 pairs = 46 chromosomes